Browsing University of Hertfordshire by Author "Deacon, Niall"

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    • 197 CANDIDATES and 104 VALIDATED PLANETS in K2's FIRST FIVE FIELDS 

      Crossfield, Ian J M; Ciardi, David R.; Petigura, Erik A.; Sinukoff, Evan; Schlieder, Joshua E.; Howard, Andrew W.; Beichman, Charles A.; Isaacson, Howard; Dressing, Courtney D.; Christiansen, Jessie L.; Fulton, Benjamin J.; Lépine, Sébastien; Weiss, Lauren; Hirsch, Lea; Livingston, John; Baranec, Christoph; Law, Nicholas M.; Riddle, Reed; Ziegler, Carl; Howell, Steve B.; Horch, Elliott; Everett, Mark; Teske, Johanna; Martinez, Arturo O.; Obermeier, Christian; Benneke, Björn; Scott, Nic; Deacon, Niall; Aller, Kimberly M.; Hansen, Brad M S; Mancini, Luigi; Ciceri, Simona; Brahm, Rafael; Jordán, Andrés; Knutson, Heather A.; Henning, Thomas; Bonnefoy, Michaël; Liu, Michael C.; Crepp, Justin R.; Lothringer, Joshua; Hinz, Phil; Bailey, Vanessa; Skemer, Andrew; Defrere, Denis (2016-09-02)
      We present 197 planet candidates discovered using data from the first year of the NASA K2 mission (Campaigns 0-4), along with the results of an intensive program of photometric analyses, stellar spectroscopy, high-resolution ...

    • 47 new T dwarfs from the UKIDDS large area survey 

      Burningham, B.; Pinfield, D.J.; Lucas, P.W.; Leggett, S.K.; Deacon, Niall; Tamura, M.; Tinney, C.G.; Lodieu, N.; Zhang, Z.; Huelamo, N.; Jones, H.R.A.; Murray, D.N.; Mortlock, D.J.; Patel, M.; Barrado y Navascues, D.; Zapatero Osorio, M.R.; Ishii, M.; Kuzuhara, M.; Smart, R.L. (2010)
      We report the discovery of 47 new T dwarfs in the Fourth Data Release (DR4) from the Large Area Survey (LAS) of the United Kingdom Infrared Telescope (UKIRT) Infrared Deep Sky Survey with spectral types ranging from T0 to ...

    • 76 T dwarfs from the UKIDSS LAS : benchmarks, kinematics and an updated space density 

      Burningham, B.; Cardoso, C. V.; Smith, Leigh; Leggett, S.K.; Smart, R.L.; Mann, A. W.; Dhital, S.; Lucas, P.W.; Tinney, C.G.; Pinfield, D.J.; Zhang, Z.; Morley, C.; Saumon, D.; Aller, K.; Littlefair, S. P.; Homeier, D.; Lodieu, N.; Deacon, Niall; Marley, M. S.; van Spaandonk, L.; Baker, D.; Allard, F.; Andrei, A.H.; Canty, J.; Clarke, J.; Day-Jones, A. C.; Dupuy, T.; Fortney, J. J.; Gomes, J.; Ishii, M.; Jones, H.R.A.; Liu, M.; Magazzu, A.; Marocco, F.; Murray, D. N.; Rojas-Ayala, B.; Tamura, M. (2013-07)
      We report the discovery of 76 new T dwarfs from the UKIRT Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS). Near-infrared broad- and narrow-band photometry and spectroscopy are presented for the new objects, along ...

    • Eight new T4.5-T7.5 dwarfs discovered in the UKIDSS large area survey data release 1 

      Lodieu, N.; Pinfield, D.J.; Leggett, S.K.; Jameson, R.F.; Mortlock, D.J.; Warren, S.J.; Deacon, Niall (2007)

    • Fifteen new T dwarfs discovered in the UKIDSS Large Area Survey 

      Pinfield, D.J.; Burningham, B.; Tamura, M.; Leggett, S.K.; Lodieu, N.; Lucas, P.W.; Mortlock, D.J.; Warren, S.J.; Homeier, D.; Ishi, M.; Deacon, Niall; McMahon, R.G.; Hewett, P.C.; Zapatero Osorio, M.R.; Martin, E.L.; Jones, H.R.A.; Venemans, B.P.; Day-Jones, A.C.; Dobbie, P.D.; Folkes, S.; Dye, S.; Allard, F.; Baraffe, I.; Barrado y Navascues, D.; Casewell, S.L.; Chiu, K.; Chabrier, G.; Clarke, F.; Hodgkin, S.T.; Magazzu, A.; McCaughrean, M.J.; Moraux, E.; Nakajima, T.; Pavlenko, Y.; Tinney, C.G. (2008)
      We present the discovery of fifteen new T2.5-T7.5 dwarfs (with estimated distances between 24–93pc), identified in the first three main data releases of the UKIRT Infrared Deep Sky Survey. This brings the total number of ...

    • A first catalogue of automatically selected ultraviolet-excess sources from the UVEX survey 

      Verbeek, Kars; de Groot, Eelco; Groot, Paul J.; Scaringi, Simone; Drew, J.E.; Greimel, Robert; Irwin, Mike; Gonzalez-Solares, Eduardo; Gaensicke, Boris T.; Casares, Jorge; Corral-Santana, Jesus M.; Deacon, Niall; Steeghs, Danny (2012-02)
      We present the first catalogue of point-source ultraviolet (UV)-excess sources selected from the UV-Excess Survey of the Northern Galactic Plane (UVEX). UVEX images the Northern Galactic Plane in the U, g, r and He Iota ...

    • The IPHAS-POSS-I proper motion survey of the Galactic plane 

      Deacon, Niall; Groot, P.; Drew, J.E.; Greimel, R.; Hambly, N.C.; Irwin, M.J.; Aungwerojwit, A.; Drake, J.; Steeghs, D. (2009)
      We present a proper motion survey of the Galactic plane, using Isaac Newton Telescope (INT) Photometric Hα Survey (IPHAS) data and Palomar Sky Survey (POSS)-I Schmidt plate data as a first epoch, that probes down to proper ...

    • Measuring ultracool properties from the UKIDSS Large Area Survey 

      Day-Jones, Avril; Marocco, F.; Pinfield, D.J.; Zhang, Zenghua; Burningham, B.; Deacon, Niall; Ruiz, Maria-Teresa; Gallardo, Jose; Jones, H.R.A.; Lucas, P.W.; Jenkins, James; Gomes, Joana; Folkes, Stuart; Clarke, James (EDP Sciences, 2013)
      We discuss the properties and of ultracool and brown dwarfs that can be measured from current large area surveys and how fundamental parameters, such as the mass function and formation history can be measured, describing ...

    • A nearby m star with three transiting super-earths discovered by k2 

      Crossfield, Ian J M; Petigura, Erik; Schlieder, Joshua E.; Howard, Andrew W.; Fulton, B. J.; Aller, Kimberly M.; Ciardi, David R.; Lépine, Sébastien; Barclay, Thomas; Pater, Imke De; Kleer, Katherine De; Quintana, Elisa V.; Christiansen, Jessie L.; Schlafly, Eddie; Kaltenegger, Lisa; Crepp, Justin R.; Henning, Thomas; Obermeier, Christian; Deacon, Niall; Weiss, Lauren M.; Isaacson, Howard T.; Hansen, Brad M S; Liu, Michael C.; Greene, Tom; Howell, Steve B.; Barman, Travis; Mordasini, Christoph (2015-05-01)
      Small, cool planets represent the typical end-products of planetary formation. Studying the architectures of these systems, measuring planet masses and radii, and observing these planets' atmospheres during transit directly ...

    • A nearby young M dwarf with a wide, possibly planetary-mass companion 

      Deacon, Niall; Schlieder, Joshua E.; Murphy, Simon J. (2016-04-11)
      We present the identification of two previously known young objects in the solar neighbourhood as a likely very wide binary. TYC 9486-927-1, an active, rapidly rotating early-M dwarf, and 2MASS J21265040-8140293, a low-gravity ...

    • A search for L/T transition dwarfs with Pan-STARRS1 and WISE. II : L/T transition atmospheres and young discoveries 

      Best, William M. J.; Liu, Michael C.; Magnier, Eugene A.; Deacon, Niall; Aller, Kimberly M.; Redstone, Joshua; Burgett, W. S.; Chambers, K. C.; Draper, P.; Flewelling, H.; Hodapp, K. W.; Kaiser, N.; Metcalfe, N.; Tonry, J.L.; Wainscoat, R. J.; Waters, C. (2015-12-01)

    • A search for southern ultracool dwarfs in young moving groups 

      Clarke, J.R.A.; Pinfield, D.J.; Galvez-Ortiz, M.C.; Jenkins, J.S.; Burningham, B.; Deacon, Niall; Jones, H.R.A.; Pokorny, R.S.; Barnes, J.R.; Day-Jones, A.C. (2010)
      We associate 132 low-mass ultracool dwarfs in the southern hemisphere as candidate members of five moving groups (MGs) using photometric and astrometric selection techniques. Of these objects, we present high-resolution ...

    • Spectroscopic follow-up of ultraviolet-excess objects selected from the UVEX survey 

      Verbeek, K.; Groot, P.J.; Scaringi, S.; Nelemans, G.; Napiwotzki, R.; Spikings, B.; Drew, J.E.; Østensen, R.H.; Steeghs, D.; Gänsicke, B.T.; Casares, J.; Corral-Santana, J.M.; Corradi, R.L.M.; Deacon, Niall; Drake, J.J.; González-Solares, E.; Irwin, M.J.; Greimel, R.; Heber, U.; Knigge, C. (2012-10-21)
      We present the results of the first spectroscopic follow-up of 132 optically blue ultraviolet (UV)-excess sources selected from the UV-Excess Survey of the Northern Galactic Plane (UVEX). The UV-excess spectra are classified ...

    • The sub-stellar birth rate from UKIDSS 

      Day-Jones, A. C.; Marocco, F.; Pinfield, D.J.; Zhang, Z. H.; Burningham, B.; Deacon, Niall; Ruiz, M. T.; Gallardo, J.; Jones, H.R.A.; Lucas, P.W.; Jenkins, J. S.; Gomes, J.; Folkes, S. L.; Clarke, J. R. A. (2013-04)
      We present a new sample of mid-L to mid-T dwarfs with effective temperatures of 11001700 K selected from the UKIDSS Large Area Survey (LAS) and confirmed with infrared spectra from X-shooter/Very Large Telescope. This ...

    • Two T dwarfs from the UKIDSS early data release 

      Kendall, T.R.; Tamura, M.; Tinney, C.G.; Martin, E.L.; Ishii, M.; Pinfield, D.J.; Lucas, P.W.; Jones, H.R.A.; Deacon, Niall (2007)

    • Ultraviolet-excess sources with a red/infrared counterpart : Low-mass companions, debris discs and QSO selection 

      Verbeek, K.; Groot, Paul J.; Scaringi, Simone; Casares, Jorge; Corral-Santana, Jesus M.; Deacon, Niall; Drew, J.E.; Gänsicke, B.T.; Gonzalez-Solares, E.; Greimel, R.; Heber, U.; Napiwotzki, R.; Ostensen, R.H.; Steeghs, D.; Wright, N.J.; Zijlstra, A. (2014-02)
      We present the result of the cross-matching between ultraviolet (UV)-excess sources selected from the UV-Excess Survey of the Northern Galactic Plane (UVEX) and several infrared (IR) surveys (2MASS, UKIDSS and WISE). From ...

    • The UV-excess survey of the northern galactic plane 

      Groot, P.; Verbeek, K.; Greimel, R.; Irwin, M.J.; Gonzalez-Solares, E.; Gansicke, B.T.; De Groot, E.; Drew, J.E.; Napiwotzki, R.; Weston, S.; Deacon, Niall (2009)
      The UV-Excess survey of the northern Galactic plane images a 10°× 185° wide band, centred on the Galactic equator using the 2.5-m Isaac Newton Telescope in four bands ( U, g, r, He i 5875) down to ∼21–22 mag ( ~20 in He i ...

    • Variability in a young, L/T transition planetary-mass object 

      Biller, Beth A.; Vos, Johanna; Bonavita, Mariangela; Buenzli, Esther; Baxter, Claire; Crossfield, Ian J. M.; Allers, Katelyn; Liu, Michael C.; Bonnefoy, Mickaël; Deacon, Niall; Brandner, Wolfgang; Schlieder, Joshua E.; Dupuy, Trent; Kopytova, Taisiya; Manjavacas, Elena; Allard, France; Homeier, Derek; Henning, Thomas (2015-11-10)
      As part of our ongoing NTT SoFI survey for variability in young free-floating planets and low-mass brown dwarfs, we detect significant variability in the young, free-floating planetary-mass object PSO J318.5-22, likely due ...